Dental pumping apparatus



Oct. 12 ,1926. i 1,602,906

L. F. KENGLA DENTAL PUMPING APPARATUS Filed March 51 1923 3 Sheets-Sheet 1 i i 19 5 :i 14- I I v. a l 1 J 15 I w Q l l LJ 1 L I lil/fl lli07 Get. 12 1926.

L- F. KENGLA DENTAL PUMPING APPARATUS Filed M rch 31 1923 3 Sheets-Sheet 2 Patented Oct. 12, 1926.

UNITED STATES PATENT ounce. i

LEO r. KENGLA, or NEW YORK, N.

1;, ASSIGNOR To SANITOR momma-mascar- TION, or BROOKLYN," new Yonx, A coarommoa or *NEW YORK.

DENTAL PUMFING' APPARATUS.

This invention relates to dental pumping apparatus, and particularly to acombined unitary mechuni'smfor producingboth compressed air and vacuum or 'air suction, an

object of the invention being to provide an improved apparatus adaptedfor these purposes, and which mechanism will be compact, relatively simple in construction, efficient in operation, durable and serviceable in use; and relatively economical to manufacture.

Acfurther object of this invention is to provide an improved dental pumping apparatus compact and simplified in construction and combining as a unit mechanism for producing and maintaining a constant supply of compressed air for various dental pur-. poses such as for spraying themouth, and also for creating air suction or vacuum, so that for instance in the treatment of dis,- eases of the mouth, such as pyorrhea, impurities or pus may be drawn from the gums or from between the teeth.

- Thus as a result ofthepresent combined vacuum and compressed'air dental ap aratus', a single unitary machine may now e used for many different purposes without requiring separate machines for supplying compressed air and providing vacuum or air suction. Furthermore the present improved apparatus is so compact and simplifiedin construction that it may beeasily operated, controlled, adjusted, and dismounted for cleaning or other purposes.

A further object of this invention is to provide an "improved dental apparatus in which the vacuum pressure maybe readily and effectually controlled and regulated, in which the air pressure and air vacuum lines or conduits may be automatically intercon- 0 trolled by a common means,and in which the improved organization such that the pump mechanism, the vacuum gauge, and

the feed lines or conduits, will be effectually r protected against the ingress of foreign matter, liquids or impurities from the mouth or other accumulations or lod'gments which tend to clog up the apparatus and interfere with its operation. e

A further object of this invention is to provide a combined compressed air and vacu; um or suction apparatus for dental purposes wherein a pair of feed conduits leading to the mouth are connected one to a compressed air chamber and one to a pump mechanism, the construction and operation being such that the pump mechanism will create air suction fromthe mouth and atthe same time supply the compressed airchamber with compressed air, which may be liberated or released for spraying the mouth or other puri A further b ect of this invent on is. to provide an improved dental apparatusfor pro ducing compressed a r and vacuum 0112111 suction, and wherein a pairof inlet cqn- Other objects of this invention will appear in the following description and appended claims thereof, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters indicate corresponding parts in the several views andhwherein Fig. 1 is a front elevation illustrating my invention; Fig. -2is an; end elevation thereohpartly broken away; Fig. 3is a fragmentarylongitudinal vertical section taken through the pump mechanism; Fig. l isa bottom; plan view taken substantially on line 4-4 of F ig. 3 and illustrating particularly the conipressed airchamber; Fig. 5 is atop plan view partly in section ofth'e present" invention; Fig. 6' is a vertic'altransverse section through the lower part of a pump cylinder and the compressed air chamber; Fig. 7 is a fragmentary, sectional plan view illustrating thecontrolmeans for the vacuum and compressed air lines; Fig, 8 is a transverse section taken substantially. on line 88 of Fig. 7'; and Fig. 9 is'a detail view illustrating the strainer device for the vacuum conduit line.

Before explaining in detail the present improvement and mode of operation thereof, I desireto have it understood that the inventionis not limited to the details of construction and arrangement of parts which are'illu'strated in the accompanying draw ings, since theinvention is capable of other embodiments, and that the phraseology which I' e'mploy is for. the purpose of description and not of limitation.

In its preferred form herein slfown'and described the present apparatus comprises a platform, base, or other suitable supporting means 9, and mounted upon this base is a motor 10 which may be of any suitable character, in the present instance the same being electrically driven. Power is transmitted to the motor 10 through wires 11 connected at 12 to the motor. The main drive shaft or arbor 13 of the motor is provided with a pulley wheel 14 which is connected by means of a belt 16 to a pulley wheel 15 carried by the crank shaft of the pump mechanism hereinafter described.

A suitable platform or bed 17 is supported by the casing of the motor 10 above the same, as by means of brackets 18 detachably connected to the motor casing at 19. The pump mechanism is mounted upon a supporting platform 20 which in the present instance is in the form of a rectangular flanged plate having a depending flange or skirt 21 embracing the supporting bed or platform 17. The pump proper as shown particularly in Fig. 1 comprises a substantially rectangular casing 22 mounted upon the supporting base 20 and bolted thereto at 23, this casing having formed or cast therewith three cylinders 2 1, 25 and 26. At the opposite ends of the cylinders are a pair of extended bearings 27 and 28 in which is j ournalled the crank shaft 29. The end bearings for the crank shafts are made in two parts for the purpose of dismounting the shaft 29, the upper parts 30 of the extended bearings 27 and 28 being detachably secured in position by screws 31. Secured at 33 to the crank shaft 29 are a plurality of piston rods 32, one for each cylinder, and having each at the lower end thereof a piston 34 adapted to reciprocate within its cylinder.

It will be seen that the crank shaft 29 is driven by means of the pulley wheel 15, which is connected to the driving wheel 14 by means of the belt 16. In order to adjust the pulley belt 16 so as to tighten the same for the purpose of taking up any slack, the supporting base plate 20 for the pump mechanism is adjustably mounted upon the platform 17. The base 20 is hinged at its rear side to the platform 17 by means of projecting hook shaped members 36 which are hooked into upstanding slotted ears carried by the platform 17. The base plate 20 is tapped to receive an adjusting screw 37 which extends through the plate 20 and engages the platform 17, so that by manipulating the screw 37 the front side of the pump base 20 may be elevated, thereby swinging the same on the hinge connections 3536. This operation will raise or lower the pulley wheel 15 so as to adjust the belt 16 A clamping screw freely passes through the base 20 and is threaded into the platform 17, this screw being adapted for the purpose of maintaining the pump mechanism in any adjusted position thereof. Thus it will be seen that by means of the adjusting screw 37 and the hinge connections, the pump may be tilted at various angles so as to vary the position of the driven pulley wheel 15 relatively to the driving wheel 1st. The lower portion 22 of the pump casing forms with the base plate 20 a compressed air storage chamber 39. The upper wall of the air chamber 39 is provided with a ribbed portion 40 having an air inlet passage or duct 11 extending therethrough. Each of the cylinders has a port or passage t3 communicating with the inlet passage ll, and a suitable intake valve 4-2 cooperates with a valve seat in the passage 13 and is held in position by means of a pin 42. The intake valves 42 for the several cylinders are opened upon the up or suction strokes of the pistons 34 and during the compression strokes the valves 12 will be closed so that air will be forced by the pistons 34 through independent ports or pas sages 45 leading into the compression chamber 39. Between each passage 45 and the compression chamber is located a suitable valve, such as a leather valve 46, which is controlled and normally held in position over the mouth of the passage 15 by means of a leaf spring 17 held in position by means of a set screw 48. Thus upon the compression or downward strokes of the pistons 34, air will be forced through passages 4-5 into the compression chamber 39, the valves -l6 opening temporarily against the action of springs 17 to permit the passage of the air.

An inlet tube 4141 having an axial passage or duct 54 extending thereinto, is detachably threaded at 52 to one end of the pump so that the duct or passage 54rwill thus communicate With inlet passage 1-1 into the several cylinders of the pump. It will be noted that the tube 1 1 has a slotted head 53 at the outer end to permit the detachment of the tube from the end 50 of the pump housing. Mounted upon the inlet tube 4 1 and abutting against the end. 50 of the pump housing, is a square sleeve 56 located at one end of an inlet pipe or conduit 5, the latter having a passage 57 communicating with an annular groove formed around the outside of the tube 4-4:, the groove 58 having a hole or port 59 communicating with the passage 54. Next to the squared end 56 of the pipe or conduit is the squared end 61 of a vacuum pipe or conduit 60,a suitable packing or gasket being interposed between the sleeves 56 and 61, the latter being loosely mounted upon the inlet tube 44. Next to the sleeve or squared end 61 and also mounted upon the inlet tube lt is a squared sleeve 62 formed at its under side with an annular chambered lUJ llt)

. from the chambered portion 63.

portion 63. Within the chambered portion 63-is located a suitable gasket 6st against which rests the mouth or upper end oi a bottle or other catch receptacle '65. The bottle 65 is supported upon a chambered holder 66 suspended by means of rods 67, the upper ends 66 of which pass freely through holes in ears or lugs 69 projecting I The upper ends or" rods 67 are threaded, and knurled nuts 70 are screwed on to the ends or the rods 67'. From this construction it will be seen that by unscrewing and removing the knurled nuts 70, the holder 66 will be removed tor the purpose of removing the catch bottle 65, and by tightening the nuts 70 upon the ends of the rods 67, the bottle 65 will be'pressed firmly against the gasket 64 so as to form an air-tight joint;

The vacuum pipe or conduit 60 is provided with a passage 71 which extends at right angles through the squared end 61 thereof and communicates with a passage or duct 72 extending through the sleeve 62. The passage 7 2 communicates with the catch bottle 65 by means of a tube 73 secured to the chambered member 63. From the bottle 65 a passage 74: communicates with an annular groove 75 extending around the inlet tube 44., this groove75 having a port or hole 76 leading into the axial passage or duct 54. Extending from the sleeve 62 is a boss 77 which is bored and tapped to receive the threaded supporting shank 78 of a suitable vacuum gauge 79. A passage 80 from the gauge 79 extends axially through the boss 77 and communicates with the annular groove or channel 75. From the foregoing construction it will be seen that the. pipes'55 and 60, the vacuum gauge 79, and the catch receptacle 65, with their associated parts, are all carried bythe inlet tube 44. Thus in order to obtain ready access to the interior passages it is merely necessaryito remove the tubular bolt 44, and since the sleeves 56, 61, and 62 are loosely mounted thereon, all of these may be readily removed so as to permit the parts to be cleaned.

Referring particularly to Figs. 5' and 7, it will be noted that the pipes or conduits 55 and 60 are provided at their rear ends with tubular extensions 86 and respectively, these being adjustably supported and held in proper position and 'alinement by means of a pair of supporting blocks 87 and 88, these blocks being detachably held in position by means of suitable'screws 88 and having therebetween suitable grooves within which the tubular extensions 85 and 86 are clamped. i i

It will be noted that the tubular extension 86 has a passage 89 therethrough terminating in a valve seat 90, anda needle or tapered valve 91 at the end of a threaded valve stem 92 is adapted to cooperate with theta-pared valve seat Adjacent to "the rear end of the threaded valve stem 92 is secured a gear 93, and at the outer end of: thevalve stem is secured a knurled hand wheel 94 The tubular extension 85 is also provided witha passage 95 terminating in a tapered valve'seat 96, and a needle valve 97 at the end of the threaded valve stem 98 cooperates with the valve seat 96. i A passage 99 is bored through the valve seat 96 and'extends at right angles'to the tube 85, this passage being located somewhat in'rear of the apex of the valve seat 96 sothat when the valve 97 is closed, the passage 99 will also be closed thereby; As illustrated in Figs. 7 and 8 a port 86 is bored from the outside through the valve seat 90 somewhat in rear of the apex ofthe valve seat so that when the valve 91 is'shifted forwardly to closed-position, the inlet port 86 will be closed", but due to the tapered configuration of the valve 91, will begraduallyi opened as the valve is shifted rearwardly.

It will be understood that the rear end 81 of the tubular extension 86 is'tapped to re ceivethe threaded portion ofthe valve stem 92. The rear end101 of the tube 85 is threaded to receive a nut- 101, the threaded portion 101 also beingbored and tapped to cooperate with the threadszon the valve stem 98. Between the nut101 and the end of the. threaded shank 101 is. interposed suitable packing 102 so as to provide an airtight joint. V Secured. to the .outer'endof the valve stem 98 is a gear 103 meshing with gear 93. Thus by'turning the knurled wheel94 in one direction the gear 93 will be rotated in the same direction, while the gear-1 03 will be rotated in the oppositev direction, this operation resulting in shiftingthe valves 91 and 97 in opposite'directions. The teeth of the gears 93 and '103 permit the gears to shift longitudinally one relatively to the other, .so that for instance when the gear 93 is rotated so as-to shift'the valve stem 92' rearwardly to open the valve 91, the gear 103v will be rotated by gear 93 to. shift the valve stem 98in the opposite direction thereby closing off theivalve. 97. During this operation the gear 93 will slide rearwardlyrelatively to the. gear 103 which will slide forwardly.-

The passage 99v which communicates with the valve seat 96 extends. through a nipple projecting at right angles from the tubular extension 85. The 'outer end of the nipple 100 is tapped to receive a tubular exteriorly threaded strainer 104, the strainer having at one end a tapered wire gauze portion 105. An axial passage 116 extends through the tube 104 and terminates at its outer "end in a transverse slot 117. It will be seen thatthe strainer. device may be read? ily removed from the nipple 1.00 by, unscrewing it therefrom, and by means of the wire gauze 105 any foreign matter will collect in the strainer, thus preventing the same from becoming lodged in the valve mechanism, or being sucked into the pump. A rubber tube 116 may be inserted over the nipple 100 and this tube leads to a suitable dental device, such as an applicator for use in the treatment of pyorrhea or other diseases of the month. At the rear of the housing 22 for the compressed air chamber 39 is located a suitable coupling 107 having a passage 108 communicating with the compressed air chamber 39. Secured to this coupling is outlet pipe or conduit 106 extending downwardly and underneath the pulley wheel 14. The outer end of this pipe is threaded and extends through a pair of supporting blocks 111 and 111a secured together by means of suitable screws. A pair of lock nuts 109 and 110 are screwed on to the pipe 108, one at each side of the supporting blocks 111 and 111a. A flexible or rubber tube 112 is connected to the end of the pipe 106 and communicates with a suitable compressed air storage tank 113. This tank may be of suitable construction or type and has an outlet pipe which leads to the mouth, so that when the compressed air is liberated at any desiredtime through the pipe or conduit 11%, the same will operate a suitable spray or other device for the.

mouth. The storagetank 113 may be used as an auxiliary to the storage chamber or tank 39, and may be provided with a suitable gauge 115 for indicating the pressure within the tank or chamber.

In the operation of the present apparatus it will be seen that the driving wheel 14 will operate by means of belt 16, the pulley wheel 15 thereby causing the crank shaft 29 to revolve, thereby reciprocating the pistons 34: within the several cylinders. ll hen it is desired to operate the pump mechanism for air suction or vacuum purposes, the knurled wheel 9 1 will be rotated to close of? the valve 91 and open the valve 97 in the vacuum conduit 60, 85. At this time the air will be sucked in through the tube 1.18 leading to the mouth, passing through strainer 105 which removes any foreign matter therefrom, and then passing through the passage 99 into the main conduit 60, 85. The air is drawn through passages 71-72 and tube 73 into the catch bottle 65, which will catch or retain any liquid that may have accidentally been drawn through the tube 118. From the catch bottle 65 the air is drawn through passages T l, 75, and 76 into the inlet tube 4: 1, and is drawn through the passage 54 thereof into the cylinders. The vacuum gauge 79, which. communicates with the annular groove or passage 75 will be operated to indicate the vacuum or pressure.

Upon the compression stroke of the several pistons the air will be forced into the con1- pressed air chamber 39 which will be drawn off to a reserve compressed air chamber or tank 113. The compressed air may be liberated from the tank at any time during the operation of the vacuum system, so that compressed air and vacuum may be used by the same apparatus at the same time.

In order to decrease or increase the vacuum which will be indicated by the gauge '79, it is merely necessary to rotate the knurled wheel 94 so as to close off to the desired extent the valve 97. When the wheel is rotated the gears 93 and 103 will revolve in opposite directions, and hence in shifting the valve 97 toward its valve seat, the valve 91 will be shifted away from its valve seat, thereby admitting air through the port 86. In this manner a reduction in the vacuum is obtained, such adjustment being accomplished by simultaneously controlling the valves 91 and 97.

llhen it desired to operate the coinressed air line alone, it is merely necessary to rotate the wneel 9 1- and close off the valve 97, this operation causing the valve 91 to open. The operation of the pistons in the several cylinders will cause air to be drawn, during tne suction strokes of the pistons, through the port 86 The air will be carried or drawn through the pipe or conduit 55, and through passage 57 into the annular groove or passage 58. Thence the air will be drawn through the port 59 directly into the passage 54 in the inlet tube 44, and will be drawn into the cylinders. Gn the compression stroke of the pistons this air will. be forced through the ducts 15, past the valves 16 into the compression chamber It will be seen that in the operation of the compressed air line, the air will be drawn directly through port 59 into the inlet tube a l, whereas during the operation of the vacuum line, the air will be drawn first through passages 71. 72, and 73 into the catch bottle 65, thence through the ports 74: and 76 into the inlet tube lia By means of the detachable strainer 1. and the detachable catch bottle 65, all accidental impurities in the air sucked from the mouth by the pump will be removed. The strainer 10a is quickly detachable for purposes of cleaning or replacing the same, and the catch bottle 65 may be easily removed for cleaning merely by unscrewing the thumb nuts 70 and detaching the holder 66. The pipes and together with the inlet tube and sleeve 62, may all be easily and quickly cleaned merely by unscrewing the inlet tube 44 from which the several parts may be readily removed.

It is to be understood that by describing in detail herein any particular form, structure, or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made, orall of the modes of its use, I claim:

1. In an apparatus of the class described, the combination of a pump, a tube having a passage communicating with said pump and detachably connected to the pump, a vacuum conduit and an air conduit each terminating in a sleeve shiftably mounted on said tube, said air conduit having direct communication with said passage, and a catch receptacle having independent communication with said vacuum conduit and said passage.

2. In an apparatus of. the class described, the combination of a pump, a tube detachably connected to said pump and having an air inlet passage into the pump, an air pipe having a sleeve shitta'bly mounted on said tube and an air passage into said tube, a vacuum pipe having a sleeve shiftably mounted on said tube and an outlet exterior to said tube, third sleeve shittably mounted on said tube, and a catch receptacle detachably carried by said third sleeve and having a passage connected to said outlet and a passage into said tube.

3. In an apparatus of the class described, the combination of a pump, a compressed air chamber connected thereto, an air inlet tube connected to said pump, a sleeve mounted on said tube and having at the underside a chambered portion, a catch receptacle having the top thereof releasably fitting into said portion, and an air inlet conduit leading into the top of said. receptacle.

4;. In a dental apparatus the combination of a compressed air chamber having. an outlet leading to the mouth, a pump mechanism for forcing air thereinto, a vacuum conduit connected to said pump mechanism, an inlet conduit also connected to the pump mechanism, means for operating said pump mechanism, interconnected means for controlling the flow of air through said vacuum and inlet conduit, a catch receptacle and vacuum gauge located between said vacuum conduit and pump mechanism, and a common means for supportin said receptacle, gauge, and conduits and having a passage communicating withall of the same.

5. In an apparatus of the c'lassdescribed, the, combination of a pump, a tube connected to said pump, an air conduit and a vacuum conduit each independently connected .to said tube, and a catch receptacle, said vacuum conduit having an inlet into the top of said receptacle and said receptacle having an outlet at its top into said tube.

6. In an apparatus of the class described,

the combination of a pump comprising a cylinder having-a reciprocating piston, a compressed air tankconnected to saidcylinder, a pair of conduits connected tov said pump and including a vacuum conduit, a pair of independently supported valve means for controlling the flow of air through said conduits, and means for simultaneously and progressively opening one of said valve 7 means While closing the other.

7 In an apparatus of the class described the combination of a pump, a compressed air chamberconnccted thereto, a pair of inlet conduits connected to said pump and including a vacuum conduit, valve means for controlling the flow of air through each conduit, and means for operating said valve meanstand effective to open either valve means while closing the other.

8. The combination of pump mechanism,

an inlet tube having an air passage communicating with said pump, an air conduit connected to said tube and opening into said air passage, a vacuum conduit connected to said tube and having an outlet passage exterior to said air passage, a catch receptacle having separate communication with said'outlet passage and air passage, a valve located in each of said conduits, and means for progressively. shifting said valves simultaneously in opposite directions to control the relative proportion of air drawn by the pump through both conduits. 9. The combination of pump mechanism, an inlet tube having an air passage communieating. with said pump, an air conduit connected to said tube'and opening into said air passage, a vacuum conduit connected to said tube andhaving an outlet passage exterior to said airpassage, a catch receptacle having separate communication with said outlet passage and air passage, an endwise shiftable valve located in each of said con duits, and means for progressively shifting said valves simultaneously in opposite directions'to control the relative proportion of air drawn by the pump through both conduits. I

10. The combination ofpump mechanism, an inlet tube having an air passage communicating with said pump, an air conduit connected to said tube and opening into said airpassage, a, vacuum conduit connected to said tube and having an outlet passage exs terior to said passage, a catch receptacle hav ing separate communication with said outlet Pass n a r p ss g a val ate in cachet said conduits, and means comprising Pa r c mesh ng sea nn c ed to s valves for progressively shiftingsaid valves simu aneous y n'orne tedi e i es. 0.01% twl the re tive plnpa t en f draw ythe pump through both conduits;

11. In an apparatus of the class described the combination of a pump comprising a plurality of cylinders having reciprocating pistons operating therein, a compressed air chamber adjacent to said cylinders, an inlet means having; a passage communicating with said cylinders, outlet means having independent passages connecting said cylinders and chamber, valve means located between said last passages and chamber, a vacuum gauge, a vacuum conduit communicating with said gauge and inlet means, and means carried independently of said cylinders tor controlling the vacuum upon said gauge.

12. In an apparatus of the class described the combination of a pump comprising a plurality of cylinders having reciprocating pistons operating therein, a compressed air chamber adjacent to said cylinders, an in let means having a passage communicating with said cylinders, outlet means having independent passages connecting said cylinders and chamber, valve means located be tween said last passages and chamber, a vacuum gauge, a vacuum conduit, a catch receptacle interposed between said conduit and gauze and communicating with said inlet means, and means carried independently of said cylinders for controlling the vacuum upon said gauge.

13. In an apparatus of the class described the combination of pump mechanism, an inlet tube having a passage communicating with said mechanism and detachably connected thereto, and an air inlet pipe having; one end thereof mounted upon said tube and having a port communicating with said passage, said pipe being detachable through the medium of said inlet tube.

141-. In an apparatus of the class described the combination of pump mechanism, an inlet tube detachably connected to said mechanism and having a passage communicating therewith, a pair of conduit pipes supported at one end by said inlet tube, a vacuum gauge also supported upon said inlet tube, said conduit pipes and gauge being detachable through the medium of said tube.

15. In an apparatus of the class described the combination of pump mechanism, an inlet tube detachably connected to said mechanism and having a passage communicating therewith, a pair of conduit pipes supported at one end by said inlet tube, a vacuum gauge and a catch receptacle also supported by said inlet tube, said conduit pipes, gauge, and receptacle being detachable through the medium of Said tube.

16. In an apparatus of the class described the combination of pump mechanism, an in let tube detachably connected to said mechanism and having a passage communicating therewith, a pair of conduit pipes supported at one end by said inlet tube, a vacuum gauge and a catch receptacle also supported by said inlet tube, said conduit pipes, gauge, and receptacle being detachable through the medium of said tube, and one of said pipes communicating with the inlet tube passage through the medium only of said receptacle.

1?. In an apparatus o1 the class described the combination of pump mechanism, an inlet tube having,- a passa c communicating with said mechanism, supporting means carried by said inlet tube, a catch receptacle carried by said supporting means, and communicating with said passage, and an air conduit communicating with said passage through the medium of said receptacle, and means for detaching said receptacle and its supporting means.

18. In an apparatus of the class described the combination of a motor having a driving wheel, pump mechanism mounted upon the motor and having a driven wheel connected to said driving wheel, a compressed air chamber connected to said pump mechanism, and means for adjusting said pump mechanism and chamber relatively to said motor thereby to adjust said driven wheel relatively to said driving wheel.

19. In an apparatus of the class described the combination of a motor having a driving wheel, pump mechanism having a com pressed air chamber therebeneath and hingedly and detachably connected above said motor and having a driven wheel connected to said driving wheel, and means for adjusting said pump mechanism and chamber about said hinged connection thereby to adjust said driven wheel relativcly to said driving wheel.

20. In an apparatus of the class described the combination of pump mechanism comprising a plurality of cylinders having reciprocating pistons, a compressed air chamber extending beneath said cylinders, an inlet tube communicating with said pump, a pair of conduits connected to said tube and including a vacuum conduit, and a catch receptacle interposed between said vacuum conduit and tube.

21. The combination of a pump comprising cylinders and reciprocating pistons, a compressed air chamber beneath said cylinders and having valve connection therewith, said pump having a lengthwise passage between said cylinders and chamber, a tube having an inlet passage in prolongation of said first passage, a vacuum conduit, and a catch receptacle independently communicating' with said inlet passage and said vacuum conduit.

Signed at 1822 Park Row Bldg, New York, N. Y., this 28 day of llarch 1923.

LEO F. KENGLA. 

